Plz Help! Name the congruent triangles and justify the reason for congruence?

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?

Can someone me find the original price? the discount is 5% and the sale price is $68.40